Answers are grounded in this paper and cite their sources.
A population study has been carried out among schoolchildren in the City of Coventry in order to ascertain the frequency of mental retardation associated with the fragile X chromosome. The prevalence of the fragile X mental retardation syndrome in the 11 to 16 year age group (the age of greatest ascertainment) was about 1.0 per 1,000 and therefore indicates that the syndrome is a major cause of mental retardation.
No takes yet. Share an insight, caveat, or question.
Webb et al. (1986) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: